When exercising a persons pulse rate should not exceed a certain limit which depends on his or her own age. This maximum rate is represented by the expression 0.8(220-a) where a is age in years. Find?

To find the maximum pulse rate for a person during exercise, you can use the formula 0.8(220 - a), where "a" is the person's age in years. For example, if the person is 30 years old, the calculation would be 0.8(220 - 30) = 0.8(190) = 152 beats per minute. This formula helps individuals determine a safe upper limit for their heart rate while exercising based on their age.